Tools & Equipment For Electronic Workbenches 3
High-Performance "Scratch & Rumble" Filters 15
Check Your Heat Loss With A Degree-Day Meter 21
Extra Keyboards For Microcomputers 26
A Low-Cost 16-LED Logic Monitor 29
Build A Vocal "Truth" Analyzer 32
Experimenting With A Sound-Effects Generator 39
Accurate Ways To Measure In-Circuit Resistances 44
Build An Infra-Red Road Icing Alert 47
Active Filter Improves Morse Code Readability 51
Build A Motion-Detector Alarm 56
Add A "Key-Down" Audible Signal To Your Computer 65
An Experimenter's Guide To Replay Control 67
Wah-Wah Foot Pedal 72
Digitally Programmed Varmint Zapper 76
A Low-Cost A/D Converter 79
Build A Metal Locator 82
Build A Personal Radiation Monitor 87
Build A Photo Darkroom Sink Sentinel 92
How To Add Triggered Sweep To An Oscilloscope 98
A 3-Way Drive System For Speakers 102
Special Counter Circuits For Experimenters 107
Measuring Large Currents With A DMM 111
Troubleshooting Phase-Locked-Loop Circuits 114
Build An Automobile Windshield Wiper Controller 118
Inexpensive Auto Battery Tester 121
How Far Did You Cycle Today? 123